In a free country, I wouldn't have to prove the danger. You would have to prove the need.
It's the essence of an unfree country that the state enjoys the presumption of authority to act as it pleases.
Most of those overeacting seem to be concerned about its danger. There will be few, if any, attached without need.
There is nothing which would prevent the Law from attacting them on a wholesale basis however except cost. It does not violate any constitutional provisions that I am aware of. Nor does it give the cops any authority in itself to do anything else.